Optimization design for box of composite wing based on effective stiffness matrix

Based on stiffness matrix, the modulus of composite laminate is translated to the modulus of orthotropic plate and the stiffeners are idealized as beam. In the method of combining multi-island genetic algorithm with sequential quadratic algorithm, the thickness of panels and the area of stiffeners are regarded as design variables and the weight of the box of composite wing as objective function to design the structure of a high aspect-ratio composite wing with multiple variables and constraints. The numerical example shows that the weight of the composite structure is reduced by 9.55% and the optimized time is relatively shorter.